Dai Dong-Jue, Li Li, Liu Zi-Fang, Zhao Min, Feng Jia-Liang, Lai Wei, Zeng Yan-Mei, Zhou Yu, Liu Lu-Yun, Deng Shi-Huai
College of Resources and Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China.
Huan Jing Ke Xue. 2012 Apr;33(4):1063-70.
Integrated PM2.5 aerosol samples were collected at Baima Spring Scenic Area, a forest site of Yaan, Sichuan Province, during the summer of 2010. Organic speciation including isoprene oxidation products (2-methyltetrols, C5-alkene trols, 2-methylyceric acid), alpha-/beta-pinene oxidation products (norpinic acid, 3-hydroxyglutaric acid, 3-methy-1,2,3-butanetricarboxylic acid), and small molecular carboxylic acid (malic acid, 2-hydroxyglutaric acid) were analyzed. The generation mechanisms of SOA as well as their influencing factors were particularly discussed. Results show that average concentrations of 2-methyltetrols, C5-alkene triols, 2-methyglyceric acid, norpinic acid, 3-hydroxyglutaric acid and 3-methy-1,2,3-butanetricarboxylic acid are 63.3, 45.0, 4.4, 4.1, 5.0, 5.3 ng x m(-3) respectively, of 24-hour lapse samples. SOA compounds are consistent with higher concentrations in the day than during the night only except for norpinic acid. Relatively high level of biogenic SOA at the study area is concerned with many environmental factors, i. e. local abundant vegetations, warm and humid climate, sunken valley topography, the atmospheric pollution state, etc.
2010年夏季，在四川省雅安市的一个森林地点——白马泉风景区采集了综合PM2.5气溶胶样本。分析了有机物种，包括异戊二烯氧化产物（2-甲基四醇、C5-烯烃四醇、2-甲基甘油酸）、α-/β-蒎烯氧化产物（降冰片酸、3-羟基戊二酸、3-甲基-1,2,3-丁三羧酸）和小分子羧酸（苹果酸、2-羟基戊二酸）。特别讨论了二次有机气溶胶的生成机制及其影响因素。结果表明，24小时间隔样本中，2-甲基四醇、C5-烯烃三醇、2-甲基甘油酸、降冰片酸、3-羟基戊二酸和3-甲基-1,2,3-丁三羧酸的平均浓度分别为63.3、45.0、4.4、4.1、5.0、5.3 ng x m(-3)。除降冰片酸外，二次有机气溶胶化合物白天的浓度高于夜间。研究区域相对较高水平的生物源二次有机气溶胶与许多环境因素有关，即当地丰富的植被、温暖潮湿的气候、山谷地形、大气污染状况等。
